Clutch.



Patented Mar. 4, I902.

H. l. ILLINGWORTH.

C L U T 6 H (Application filed Aug 26, 1901.)

3 Sheets-Shoat I.

(No Model.)

I Patentedlarh i, "I992, H. I. ILLINGWORTH.

CLUTCH. (Application filed Aug. 26, 1901.)

(No Model.)

3 Shank-Sheet 2.

IIS cc PMOfU-LITHQ. wnmnomn, n. c.

Patented Mar. 4, I902.

H. L ILLINGWDRTH. I

CLUTCH.

(Lpplicltion filed Aug. 26, 1901.)

3 shuts shoot 3.

(No Model.)

Ivar/671 rylllg-ozywork THE mums wzruu 50.. PHd'rD-LITHO.. wAsums'rom nc TNrTED STATES PATENT FmcET.

i HARRY I. ILLINGWORTH, OF LYNN, MASSACHUSETTS, ASSIGNOR TO CHARLES E.RILEY, OF NEWTON, MASSACHUSETTS.

CLUTCH.

SPECIFICATION forming part Of Letters Patent N 0. 694,550, dated March4, 1902 Application filed August 26, 1901. Serial No. 73,382. (Nomodel.)

To all whom it may concern: members when theyreachapredeterminedan- Beit known that I, HARRY I. ILLINGWORTH, gular position and to move thedriven member acitizen oftheUnited-States, residingatLynn, to bring itsfriction-brake surface into contact in the county of Essex and State ofMassawith the fixed friction-brake surface, such 55 5 chusetts, haveinvented an Improvement in mechanism being so constructed that the fric-Clutches, of which the following description, tion created between thefriction-brake surin connection with the accompanying drawfaces operatesto stop the driven member of ings,isaspecification, like figures on thedrawthe clutch in a substantially predetermined ings representinglikeparts. 1 angular position. The clutch-disengaging 60 IO In certainclasses of ma'chinerysuch as mechanism, which also constitutes thebrakesewing-machines,nailing-machines, and simiapplying mechanism,includes a toggle or lar devices-itis desirable to stopthe machineknuckle joint so constructed that when the at a certain predeterminedpoint in the cycle toggle-joint is straightened the clutch-disem' ofoperations-for instance, in asewing-magaging means is rendered active,and when 65 I5 chine with the needle raised 'and at its hightheknuckle-joint is broken the said clutchest point and in anailing-machine with the disengaging means is inoperative. Suitabledriver-bar raised and the machine ready to mechanism, such as a spring,is used to aureceive the work-and to accomplish this it tomaticallystraighten said toggle. or knuckle has been customary to drive themechanism joint, and thus render the clutch-disengaging 7o bymeans of aclutch and provide a bunteror -means operative, the action of saidspring other positivestop to engage the driven clutch being controlledmanually in some suitable member or some moving part of the mechanway,as by a foot-treadle or hand-lever. Unism when the clutch members aredisengaged der normalconditions, therefore, the spring in order to stopthe mechanism at a predeteror other device automatically straightens themined point in the cycle of operations. toggle-lever, thus rendering theclutch-dis- While the hunter or positive-stop device is engaging meansactive, whereby the clutch applicable to light machines in which the1110- members are disengaged and the brake is apmentum of the parts iscomparatively small, plied. W hen, however, it is desired tooperpractice has demonstrated, that in heavy maate the mechanism to bedriven, the manu- 8o chines where the moving parts haveconsidallyoperated devices are manipulated to erable momentum suchhunters or positive brake the toggle-lever, thus rendering the stops areimpracticable because of the jar clutch-disengaging and brake-applyingmechgiven to the machinery bysuch positive sudanism inactive andallowing the clutch memden stopping. bers to be thrown into engagement,such con- 85 5 This invention has for its object to provide ditioncontinuing so long as the manually- 'a simple inexpensive clutch devicewhich operated devices are under control. As soon comprises a minimumnumber of parts and as the manually-operated devices are released whichis especially adapted for use in driving the knuckle-joint isautomatically straightmachines where it is desired to stop the sameened, the clutch members are disengaged, and 90 0 at a predeterminedpoint in the cycle of opthe brake is applied as above described.

erations, which clutch device may include a In the preferred embodimentof my invenfriction-brake or stop device so constructed tion the drivenclutch member is carried by that when the brake is appliedthe drivenasleeve mounted upon the shaft, and springs clutch member will stop in asubstantially between the sleeve and clutch member oper- 5 predeterminedangular position. The clutch ate to automatically throw said clutchmemcomprises a driving and a driven clutch memhere into engagement. Thedriven clutch her which are normally in operative engagememberhaswedge-shaped portions which are ment with each other, the drivenclutch memadapted to engage an abutment carried at the her having afriction-brake surface which 00- end of a lever pivoted to any suitablefixed 10: operates with a fixed friction brake surface. support. Thelever is turned about its ful- Mechanism is used to disengage the clutchcrum to throw the abutment into or out of operative position by means ofa toggle or knuckle joint device so arranged that when the abutment isin operative position the levers or arms of the toggle or knuckle jointare straightened or in alinement, thereby serving to lock the abutmentinits operative position. hen the abutment is in its operative positionthe rotation of the clutch brings the wedge-shaped portion against thesaid abutment, thereby moving the driven clutch member longitudinally todisengage it from the driving clutch member and to bring itsfriction-brake surface against the fixed friction-brake surface tothereby stop the driven member,the parts being so constructed that thedriven member will stop in substantially a predetermined angularposition.

My improved clutch includes a minimum number of parts and is soconstructed that it may be either mounted on a rotating or a fixedshaft, the clutch being what I would term a self-contained clutch.

In the drawings, Figure 1 illustrates one form of my clutch in sideelevation. Fig. 2 is a vertical central section. Fig. 3 is a section onthe line a; m, Fig. 2. Fig. at illustrates a modified form of myinvention. Fig. 5 is a detail,to be hereinafter referred to; and Fig. 6is a side view of my improved clutch with the clutch members disengaged.

The two clutch members are designated by 3 and 4, respectively, 4 beingthe driving clutch member and being provided with the usual conicalfriction-clutch surface 6 and having on its periphery a suitable groove5 to receive the driving-band. The said driving clutch member is shownas rotatively mounted upon the shaft 7, but is held from longitudinalmovement thereon by being confined between the washers 8 and 9, the saidwashers bearing against suitable shoulders on the shaft 7, and thewasher 8 being held in position by means of a suitable nut 10.

In the'embodixnent of my invention illustrated in Figs. 1 and 2 theshaft 7 is a rotary shaft and is connected in any suitable way to theoperative parts of the mechanism to be driven, and said shaft hasmounted thereon to rotate therewith the driven clutch member 3, which isprovided with a conical friction-surface 12, cooperating with thefrictionsnrface (3. As illustrated, the driven clutch member 3 iscarried by a suitable sleeve 13, which is made fast to the shaft 7 inany suitable way, preferably by means of the pin 14, passing throughsaid sleeve and shaft. The sleeve 13 has at one end the flange 15,provided with sockets adapted to receive one end of a suitable spring16, the other end of the spring being seated in a suitable socket 17inthe driven clutch member. A pin 18, made fast to the driven clutchmember 3, is received in a suitable socket 19 in the flange of thesleeve 13, said pin operating to connect the sleeve and driven clutchmember together for rotation, but allowing a relative longitudinal Thesprings movement between the same.

The driven clutch member 3 is provided I with the annular flange 20,having secured in any suitable way to its face an annular friction-ring21,the said friction-ring being adapted to cooperate with a fixedfriction-brake surface 22, carried by any suitable part of themechanism, and when it is desired to stop the rotation of the mechanismthe driven clutch member is disengaged from the driving clutch member 4,and the friction-brake surfaces 21 2 are brought into engagement, themechanism for accomplishing this operating to bring the friction-brakesurfaces into engagement with sufficient pressure to stop the rotationof the driven clutch member in substantially a predetermined angularposition.

In the preferred embodiment of my invention I thus disengage the clutchmembers and apply the friction-brake by means of a movableclutch-disengaging member, which cooperates with a ing or projectionupon the driven clutch member, one of said partsthat is, either theclutch-disengaging member or the lug or projectionhaving a camconstruction whereby when the clutch-disengaging member is moved intothe path of the projection the engagement of the projection with theclutch-disengaging member serves to give the driven clutch member amovement longitudinally of the shaft suflicient to disengage the samefrom the driving clutch member and to bring the friction-brake surfacesinto contact.

In the drawings the movable-clutch-disengaging member is in the natureof a? movable abutment 25, and the lug or projection on the drivenclutch member is in the nature of a cam or wedge shaped projection 23.The abutment is mounted to be moved into and out of the path of thewedge-shaped projection 23, and when the said abutment is moved into thepath of the projection, as shown in dotted lines, Fig. 1', whichposition of the abutment I have termed the operative position, therotation of the clutch brings the wedge shaped portion 23 against thesaid abutment, and the cam-like action between the projection 23 and theabutment serves to disengage and give the driven clutch member amovement longitudinally of the shaft, the momentum of the parts crowdingthe wedgeshaped portion between the abutment and the fixedfriction-surface 22 with sufficient force to stop the driving clutchmember at a substantially predetermined angular position.

The abutment 25 is carried upon one arm 26 of an elbow-lever fulerumed,as at 27, to any suitable fixed support, the other arm 28 of said leverhaving connected thereto the arm 20 of a toggle or knuckle lover, theother 7 in dotted lines, Fig. 1.)

I so constructed that when the abutment is.

arm, 30, of said knuckle-leverbeing pivoted, as hereinafter described,to a fixedsupport.

The construction of the knuckle-lever is such that when the lever isbroken, as in the full-line position, Fig. 1, the arm 28 of theelbow-lever is raised and the abutment 25 is in its inoperativeposition,w hile when the toggle-joint is straightened that is, the arms29 30 thereof are in alinementthe abutment is thrown into its operativeposition. (Shown The toggle or knuckle joint is preferably in itsoperative position the arms thereof will have passed slightly by thedead-center until the lip or stop 50 on the arm 28 engages the arm 26,as shown in dotted lines, Fig. 1,

whereby the abutment is lockedin its operative position. I

Extending from the arm 30 of the togglejoint is an arm 31, havingconnected to. the end thereof in any suitable way a springer similardevice 32,- which is fastened to any suitable fixed support, as 33,the-said spring tending normally to throw the toggle-joint into itsstraightened or locked position, as.

seen in dotted lines, Fig. 1, to bring the abut; ment into-its operativeposition.

A suitable link 34, connected to the arm. 31 and also the footorhandlever 35,. serves to throw the knuckle-joint into full-line po-.-

sition, Fig. 1, tothereby bring theabutment into its inoperativeposition.-

It will thus be seen that the abutment-operating mechanism comprisesautomatic means: for moving the abutment into its operative position,and manually-operated means to move said abutment into itsinoperativeposition.)

The operation of the parts will be readily understood from the abovedescriptiomand; is as follows: When it is desired to start the mechanismoperated by the clutch, the manually-operated lever 35 is depressed. tobreakthe toggle-joint and throw the abutment from the dotted to the fullline position,Fig. 1.-

The spring 16 then automatically operates to bring the clutch membersinto engagement, whereby the driven clutch member 3 is caused to rotateand the mechanism is operated. When it is desired tostop the mechanism,the manually-operated lever 35 is released and-the spring 32 operates toautomatically straighten, the knuckle-joint and throw the. same into thedotted-line position, Fig. 1, or the full-line position, Fig.6, therebybringing. the abutment into and locking it in its operative posi tion.As the clutch rotates the wedge-shaped portion 23 engages the abutmentand operates to disengage the driven clutch member from the drivingclutch memberand to bring the friction-brake surfaces 21 22 intoengagement,

the said wedge-shaped portion being so con- 'structed as to cause thedriven clutcl1.mem-.

her to stop at a substantially predetermined angular position. Myinvention therefore in its broadest sense comprises a clutch-disengagingmeans, which includes a toggle or knuckle joint having automatic meansto straighten the said toggle joint and man uallyoperated means to breakthe same, the construction being such. that when the toggle leverorjoint is straightened the said clutchdisengaging means is renderedactive, while when the said toggle-lever is broken the saidclutch-disengaging.means isrendered inacing the abutment is mounted on ashaft or,

pivot 27,andhas the extended hub 40, through which the pivot-27 passes,(see Fig.3,) and the end of said hub carries an arm 26 similar to thearm 26, said arm 26 carrying an abutment similar-to the abutment 25.Thearms. 2626 are situateddifferent distances from the axis ofrotationofthe clutch, asseen in Fig. 3, and the flange 20 of the driving-clutchmember has a second wedge portion 23'3 situated so as to cooperatewiththe abutment on the ar m,26". The wedge portionsare at di f -jferent radial distances from-the axis of the clutch and are soconstructed that during the,

rotation of the clutch the abutment on;-the

arm 26 will pass between the wedge 23 and the bodyof the driving clutchmember, while,

the abutmenton the arm 26 will'pass outside of themedge portion 23'.portions 23 23, however, are so situated that they simultaneouslycooperatewith their. 00-. operating abutments on the. arms-26- 26.After. considerable use the .abutments- 25 or the wedge portion 23 wouldbecome worn to. such an extent that thedriven clutch mem-. her would not.stop at the desiredpredeteh mined angular position, and tocounteractthis I preferably connect t-hearm 30 f theknuckle-joint to an adjustablepivotgwherebyi Thesaid wedge-- the operative position ,of the abutments25,

may be adjusted. to compensate for such wean; As illustrated,.thear1n;30,-.of,the knuckle, joint is pivoted to a suitable eye 4 3,havinga stem 44, which projects intoan aperture in anear et5,.secur,ed= to theframeof the machine, and adj ustin-g-screw- 46 is tapped into;

said earand bears againstthe upper'end-of said screWAA, saidadjusting-screw being heldin position byany suitable[locking-nut;47., Aset-screwetS may be used to hold the eye 43 from dropping out of the-earin any event When eitherthe abutment or the Wedge :portion 23v wears,the adjusting screw46 may be,

adjusted to lower the eye43 slightly, to thereby rock, the arms 26 andbring the abutment:

I will preferablyalso,

nearer. the flange 20.

provide the arm 30 of the knuckle-joint with the adjusting-screw -19,which passes through said arm and bears against the lip or projection 50on the arm 29, whereby the distance that the pivotal point between thearms 29 and 30 is carried past the dead-center may be adjusted as wearoccurs.

In the modification above described the stopping of the driven clutchmember is accomplished entirely by the friction between thefriction-surfaces 21 22, and while this construction will operate tostop the driven memher at substantially a predetermined point in itsrotation, yet a friction device cannot be relied upon to stop the saiddriven clutch member exactly at a predetermined point under all workingconditions, for the friction necessary to bring the said driven clutchmember to rest varies with the speed at which the clutch is running, thetension under which the machine is operating, and other conditions underwhich the machine is working. For instance, if the friction-brake devicewas so adjusted that it would bring the driven clutch member to rest ata certain predetermined point when the clutch was running at threehundred revolutions per minute it will be obvious that should the clutchmake four hundred revolutions per minute the increased momentum of theparts would carry the said driven clutch member slightly by thepredetermined point, or if the clutch were making less than threehundred the friction-brake would operate to stop the mechanism slightlyin advance of the desired point. So, also, if the tension under whichthe machine is opcrating-that is, the resistance to the operation of thepartsvaries such varying resistance will operate to vary the amount offriction necessary to bring the mechanism to rest, the resistance to beovercome aiding to a greater or less extent the friction-brake inbringing the mechanism to rest.

Other causes-such as' varying temperatures, &c.operate to render theaction of a friction brake unreliable in bringing the mechanism to restat exactly a predetermined point under all conditions, and thereforewhen itis necessary that the parts should stop in exactlya predeterminedpoint in the rotation of the clutch member under all conditions I mayemploy in addition to the friction-brake devices a positive stop, suchas is illustrated in Fig. 6, wherein the wedge portion 23 is providedwith a lip or projection 240, which is adapted to engage the abutment 25and positively stop the driven clutch member at exactly a predeterminedpoint in its rotation. In other respects the mechanism illustrated inFig. 6 is similar to that shown in Figs. 1 and 2. In this embodiment ofmy invention the cam or inclined surface of the wedge portion 23operates to bring the friction-surfaces together with aprogressivelyincreased force, thereby nearly stopping the rotation ofthe driven clutch member, and

when the predetermined point in the rotation of the clutch member isreached the lip 240 engages the end of the abutment 25 and posi tivelystops the clutch member.

By using a combined friction and positive stop all of the jar and rackto the machinery incident to the use of a positive stop alone isavoided.

In the embodiments of my invention thus far described the driven clutchmember is mounted for rotation with the shaft which drives themachinery. This construction, however, is not necessary, as my clutch isso constructed that both the driving and driven clutch members may bemounted for rotation upon the same stationary shaft or spindle, in whichcase the driven clutch member would be provided on its periphery withgear-teeth or other suitable driving connections for operating themachinery. This form of my invention is illustrated in Fig. 4, wherein asuitable stand has secured thereto in any usual or suitable way a fixednon-rotary spindle or shaft 7, on which is mounted for rotation thedriving clutch member 4, as in the other embodiment of my invention,said driving-clutch being held against longitudinal movement between thewashers 9 and 8. In this embodiment of my invention since the shaft 7 isnon-rotary and the washer 8 also non-rotary I preferably providesuitable balls 700 between the hub of the driving clutch member and thewasher 8 to reduce friction. The driven clutch member 3 is mounted uponthe sleeve 13, as in the above-described embodiment of my invention, thesaid sleeve having the flange 15, between which and the clutch member 3are the clutch -actuating springs 16, as above described. The clutchmember 3 also carries the pin 18, the end of which is received in asuitable recess 19 in the sleeve 13', as above described. In thisembodiment of my invention, however, the sleeve 13 is mounted forrotation upon the stationary or non-rotary spindle 7, and to reducefriction preferably I employ suitable ball-bearings '71 between theflange 15 and the plate 72, carrying the fixed friction-brake surface22.

The driven clutch member 3 is provided on its peripherywith suitablegear-teeth 75, said gear-teeth being shown as on the periphery of theflange 20 and being adapted to mesh with suitable gearing driving themechanism to be operated. The abutments 25 for engaging the cam portions23 on the movable clutch member and the knuckle or toggle joint foroperating the abutments are the same in this embodiment of my inventionas that illustrated in Figs. 1 and 2 and further description is notnecessary.

In Figs. 1 and 2 I have illustrated manually-operated mechanism forthrowing the abutment from its operative into its inoperative position,and with a clutch constructed as shown it is necessary to manually holdthe abutment in its inoperative position so long as it is desired tohave the clutch operate. It

is sometimes desirable, however, to provide IIO means for stopping theclutch after it has made one complete rotation, thus constituting what Ihave termed a one-revolution clutch.

When it is desired to use my invention as a" one-revolution'clutch,Iprovide means for au toma'tically throwing the abutment from itsinoperative into its operative position when the clutch has madeapartial rotation, so that when the rotation, is complete the drivenclutch member will be stopped. For this purpose the driven clutch memberwill be provided with a cam-lug 80, which is adapt clutch member mountedthereon, both of said ed to engage a nose or projection 81 upon the arm26' of the elbow-lever, said cam operating to throw the elbow-lever intoposition to bring the abutment into operative posi-' tion. The cam 80-isso situated angularly that just before the wedge portion 23 comesopposite the abutment 25 the said cam 80 will engage the nose 81, asshown in dotted lines, Fig. 4, thereby throwing the abutment into itsoperative position and imposition to be engaged by the wedge portion 23.The abutment is locked in its operative position by the kn uckle-joint,as. above described, and

as the clutch continues its rotation the driven clutch member is stoppedat a predetermined point, as above described.

From the above description it will be seen" that I have devised aself-contained clutch device which may be used on a rotary or astationary spindle or shaft, which is simple in construction, and whichcomprises but a few operative parts.

While I have herein illustrated and described the best manner ofembodying my invention now known to me, yet I do not de sire to belimited to the exact structure here- 111 shown, as it will be obviousthat other forms of clutches may be made to embody the essentialfeatures of my invention. Therefore believing that I am the first toemploy in a clutch a clutch-disengaging mechanism wh1ch includes atoggle-joint so constructed that when the toggle is straightened thesaid clutch-disengaging means is rendered operaclutch mechanismswhich'donotrequire to be stopped in a predetermined position.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is v 1. In a clutch,'a shaft,a driving and a drivenclutch members beingcap'ableof having'a movement independent of theshaft, means to bring said clutch members into engagement, afriction-brake for the driven clutch member, and means to disengage saidclutch members and apply said friction-brake to the driven clutch memberto stop the rotation of said driven clutch member in a substantiallypredetermined angular position.

2. In a clutch, a shaft, a drivingand driven clutch member mountedthereon, means to bring said clutch members into engagement,'afriction-brake adapted. to cooperate with the driven clutch member,means tending normally to disengage the clutch members, said meansoperating to apply the frictionbrake' and stop the .rotation of thedriven clutch member in a substantiallypredetermined angular position,and manually-operated means to render said clutch-disengaging meansinactive. v 3. In a clutch, a driving and a driven clutch member, meansinclosed within the clutch and tending normally to maintain said clutchmembers in engagement, a friction -brake adapted to eooperatewith thedriven clutch member, means to automatically disengage the ,clutchmembers,'said means also operating to apply the friction-brake and stopthe rotation of the driven clutch member in asubstantially predeterminedangular position.

i. In a clutch, a driving and a driven clutch membemmeans inclosedwithin the clutch and tending normally to maintain said clutch membersin engagement, a vfriction brake adapted to cooperatewith the drivenclutch member, means, to automatically disengage the'clut'eh members,said means also operating to apply the friction-brake and stop the IOOrotation of the driven clutch member in a sub- .stantially predeterminedangular position,

and manually-operated means to render said automatic cl utch-disengagingmeans inactive.

5. In a clutch, a driving and a driven'clutch member, means to bringsaid clutch members into engagement, saiddriven clutch member having acam projection and a friction-brake .surface,'a coo peratin g fixedfriction-brake surface, and an abutment adapted to be moved into thepathof the cam projection, whereby the driven clutch member isdisengaged from the driving clutch member, and the brakesurfaces arebrought together to stop th'e rotation of the said driven clutch memberin a substantially predetermined angular posi-' tion.

6. In a clutch, a driving anda driven clutch member, means tendingnormallyto main tain said clutch members in engagement, said drivenclutch member having a cam projection and a friction-brake surface, acooperating fixed friction-brake surface, a movable/abutment, meanstending normally to maintain saidabutment in the path of the camprojection, and manually-operated means to move said abutment out of thepath ofsaid cam-projection, the construction beingsuch that whenthe'manually-operated means is inactive, the abutment is automaticallymade to engage said cam projection and thereby bring the brake-surfacesinto contact to stop the rotation of the driven clutch member in asubstantially predetermined angular position.

7. In a clutch, a shaft having a driving clutch member mounted forrotation thereon but held against longitudinal movement, a sleeve orthimble also mounted on said shaft, a driven clutch member mounted onthe sleeve to rotate therewith but adapted to have a movementlongitudinally thereof, springs between said sleeve and driven clutchmember and tending normally to maintain the clutch members inengagement, combined with a man ually-eontrolled means to disengage saidclutch members.

8. In a clutch, a shaft having a driving clutch member loosely mountedthereon, a sleeve or thim ble also mounted on said shaft, a drivenclutch member mounted on the sleeve to rotate therewith but adapted tohave a longitudinal movement thereon, springs between said sleeve anddriven clutch member and tending normally to maintain the clutch membersin engagement, a friction-brake surface on the driven clutch member, acooperating fixed friction-brake surface, and manually-controlled meansto move the driven clutch member longitudinally to disengage the clutchmembers and to bring the brakesurfaces into engagement to stop thedriven clutch member in a predetermined angular position.

9. In aclutch, adriving clutch member and a driven clutch member, one ofsaid clutch members having an annular friction-surface and the other ofsaid clutch members having a cooperating friction-s11 rface, meanstending normally to throw said members into engagement, and mechanismincluding a knucklejoint to disengage said members.

10. In a cluteh,a driving and adriven member, means tending normally tomaintain said members in engagement, an abutment, and means to move saidabutment into its operative position in engagement with the drivenclutch member to disengage said clutch members, said means including aknuckle-joint, the construction being such that when the abutment is inits operative position the knuckle-joint is straightened thereby lockingthe abutment in such position.

11. 111 a clutch, a driving and a driven clutch member, means to bringsaid clutch members into engagement, said driven clutch member having acam projection and a friction-brake surface, a cooperating fixedfriction-brake surface, a movable abutment, automatic mechanismincluding aknuckle-joint to move said abutment into its operativeposition in the path of the cam projection, the knuckle-joint beingstraightened when the abutment is in its operative position, therebylocking the latter in such position, and the abutment when engaged bythe cam projection operating to force the friction-brake surfacestogether to stop the rotation of the driven clutch member in apredetermined angular position.

12. In a clutch, a driving clutch member and adriven clutch member, oneof said members having an annular clutch-surface,and the other of saidmembers having a cooperating clutch-surface,a friction-brake adapted tocooperate with the driven clutch member, means to apply the brake andstop the rotation of said driven clutch memberata substantiallypredetermined point, said means includinga knuckle-joint.

13. In a clutch, a driving clutch member and a driven clutch member,said members having cooperating conical friction-surfaces, afriction-brake adapted to cooperate with the driven clutch member, meansto apply the brake and stop the rotation of said driven clutch member ata substantially predetermined point, said means including aknucklejoint.

14. In a clutch, a driving clutch member and a driven clutch member,said members having cooperating friction-clutch surfaces, one of saidmembers having a movement longitudinally of the shaft,a friction-brakeadapted to cooperate with the driven clutch member, means to apply thebrake and stop the rotation ofsaid driven clutch member atasubstantially predetermined point, said means including aknuckle-joint.

15. In a clutch, a driving clutch member, and a cooperating drivenclutch member, one of said members having an annular frictionclutchsurface, and the other of said members having a cooperatingfriction-clutch surface, means to bring said clutch-surfaces intoengagement, clutch-disengaging means comprising a knuckle-joint, meanstending normally to straighten said knuckle-joint, and manually-operatedmeans to break said joint, the construction being such that when theknuckle-joint is straightened, the clutch-disengaging means is renderedactive, and when the knuckle-joint is broken the clutch-disengagingmeans is inactive.

16. In a clutch, a driving clutch member having an annularfriction-surface, and a driven clutch member having a cooperatingfriction-surface, means tending normally to throw said clutch membersinto engagement, a friction-brake, and means to disengage said clutchmembers and apply the brake, said means comprising a knuckle -joint,means tending normally to straighten said knucklejoint, andmanually-operated means to break the same, the construction being suchthat when the knuckle-joint is straightened, the means for disengagingthe clutch members and applying the brake is rendered active, and whenthe knuckle-joint is broken, said means is rendered inactive.

17. In a clutch, a driving clutch member and a driven clutch member,said driven clutch member having afriction-brake surface,a cooperatingfriction-brake surface, and positive mechanism for disengaging saidclutch members when said clutch members reach a predetermined angularposition, said positive mechanism also operating to bring thefriction-brake surfaces into contact with sufficient force to cause thedriven clutch member to come to rest substantially in-apredetermined-angular position, said positive mechanism being operatedindependently of the rotation of the clutch.

18. In a clutch, a driving clutch member and a driven clutch member,means to disengage said clutch members, a friction-brake independentfrom said clutch disengaging means, and a positive stop for the drivenclutch member. 7

19. In a clutch, a driving clutch member and a driven clutch member,means to disengage said clutch members, and means to bring the drivenclutch member to rest in a predetermined angular position,said meansincluding a friction-brake and a positive stop 20. In a clutch, adriving clutch member and a driven clutch member, a friction-brakecooperating with the driven clutch member, means to disengage the saidclutch members, said means operating to apply the frictionbrakesubsequently to the disengagement of the clutch members, and a positivestop for the driven clutch member.

21. Ina clutch, a shaft, a driving clutch member mounted thereon andhaving an annular friction-clutch surface, a driven clutch member alsomounted on said shaft and havinga cooperating friction-clutch surface,means to bring said clutch-surfaces into engagement, a friction-brakefor the driven clutch member, and means to disengage saidclutch-surfaces andapply said friction-brake to the driven clutchmember, to stop the retation of said driven clutch member in asubstantially predetermined angularposition.

22. In a clutch, a shaft, a driving and a driven clutch member mountedthereon and each having a movement independent of the shaft, meanstending normally to throw said members into engagement, and mechanismincluding aknuckle-joint to disengage said members;

23. In a clutch, a shaft, a driving and a driven clutch member mountedthereon,said d'riving'clutch member having a rotary movementindependentof the shaft, and the driven clutch member having amovementlongitudinally of the shaft, a friction-brake adapted tocooperate with the driven clutch member, means to apply the brake andstop the rotation of the driven clutch member at a substantiallypredetermined point, said means including a knuckle-joint.

24. In a clutch, a shaft, a driving and a driven clutch member mountedthereon, said driving clutch member being loosely-mounted on the shaft,and the driven clutch member having a movement longitudinally of theshaft, means to bringsaid clutch members into engagement, and clutchdisengaging means comprising a knuckle-joint, means tending normally tostraighten said knucklejoint, and manually-operated means to break saidjoint, the construction being such that when the knuckle-joint isstraightened, the clutch-disengaging means is rendered active, and whenthe knuckle-joint is broken said clutch-disengaging means are inactive.

25.-In a clutch, a shaft," a driving and a driven clutch member mountedthereon, each of said members having a' movement independent of theshaft, means tending normally to throw said clutch members intoengagement, a friction-brake, and means to disengage said clutch membersand apply the brake, said means comprising a knuckle-joint,means tendingnormally to straighten said knucklejoint, and man ually-operated meansto break the same,the construction being such that when the knuckle-joint is straightened, the means for disengaging the clutchmembers and applying the brake is rendered active, and when theknuckle-joint is broken, said means is rendered inactive.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HARRY 'ILLINGWORTH. Witnesses:

LOUIS 0. SMITH, GEO. H. MAXWELL;

